Dude,,
Just replace the pistons with factory replacement parts, I blew mine and had it bored .030 over and the thing has more power than the jeep needs. I even replaced the factory 2bbl carb. in sand or mud all I do is spin, The more horsepower the more tire spin you will have. A 6 cyl is a lot better though. A 6 cyl has the torque that a V-8 just cant find. But we still need to have fun huh, That is why I kept the 304.